package cn.tedu.sp11.fallback;

import cn.tedu.web.util.JsonResult;
import com.netflix.appinfo.RefreshableAmazonInfoProvider;
import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

@Component
public class ItemFB implements FallbackProvider {
    //要返回service-id，表示这个降级类是针对哪个服务进行降级
    @Override
    public String getRoute() {
        return "item-service";//item-service访问失败会应用这个降级类
        //return “*”；针对所有服务进行降级
        //return null；针对所有服务进行降级
    }
    //该方法返回封装降级响应的对象
    //ClientHttpResponse中封装降级响应，返回
    @Override
    public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
        //在response对象中，要设置http协议的状态码、协议头、协议体
        return new ClientHttpResponse() {
            @Override//HttpStatus中封装的是状态码和状态信息，如：200  ok
            public HttpStatus getStatusCode() throws IOException {
                return HttpStatus.OK;
            }

            @Override//返回的是状态码，如：200
            public int getRawStatusCode() throws IOException {
                return HttpStatus.OK.value();
            }

            @Override//返回的是状态文本，如：ok
            public String getStatusText() throws IOException {
                return HttpStatus.OK.getReasonPhrase();
            }

            @Override
            public void close() {

            }

            @Override
            public InputStream getBody() throws IOException {
                //JsonResult ---{code:400,msg:"调用商品服务失败"，data：null}
                String json = JsonResult.err().msg("调用商品服务失败").toString();
                return new ByteArrayInputStream(json.getBytes());//返回的是流
            }

            @Override
            public HttpHeaders getHeaders() {
                //Context-Type:application/json;charset=utf-8
                HttpHeaders h = new HttpHeaders();
                h.setContentType(MediaType.APPLICATION_JSON_UTF8);
                return h;
            }
        };
    }
}
